Towns
| State | City/Town | Town Title |
|---|---|---|
| California | Inyokern | Inyokern, CA |
| California | Ione | Ione, CA |
| California | Irvin | Irvin, CA |
| California | Irvine | Irvine, CA |
| California | Isleton | Isleton, CA |
| California | Ivanhoe | Ivanhoe, CA |
| California | Jackson | Jackson, CA |
| California | Jackson St Forest | Jackson St Forest, CA |
| California | Jacumba | Jacumba, CA |
| California | Jamestown | Jamestown, CA |
| California | Jamul | Jamul, CA |
| California | Janesville | Janesville, CA |
| California | Jenner | Jenner, CA |
| California | Johannesburg | Johannesburg, CA |
| California | Jolon | Jolon, CA |
| California | Joshua Tree | Joshua Tree, CA |
| California | Julian | Julian, CA |
| California | Junction City | Junction City, CA |
| California | June Lake | June Lake, CA |
| California | Kaweah | Kaweah, CA |
| California | Keeler | Keeler, CA |
| California | Keene | Keene, CA |
| California | Kelseyville | Kelseyville, CA |
| California | Kentfield | Kentfield, CA |
| California | Kenwood | Kenwood, CA |